...
- authentication
- multi-domain handling
- protected from open-relay calls
- loose routing
- ENUM routing
- SIP.edu incoming call resolution
- NAT support
PSTN Gateway - The gateway to the PBX
Cisco Gw
Cisco CallManager
PRI card on a PC with Asterisk
GnuGk
Sample config for interfacing with the H.323 world:
- authentication
- ENUM routing